In angiosperms , which one of the following processes does not involve an unequal division ?

Options

A. Formation of microspores
B. Formation of generative cell
C. Zygotic embryogenesis
D. All of the above

Explanation

To answer the question "In angiosperms, which one of the following processes does not involve an unequal division?", we will analyze the processes involved in the reproduction of angiosperms (flowering plants) and identify which one involves equal division.

### Step-by-Step Solution:

1. **Understanding Angiosperms**:
- Angiosperms are flowering plants that produce seeds enclosed within fruits. They have distinct male and female reproductive structures.

2. **Identifying Key Processes**:
- In angiosperms, several processes occur during reproduction, including the formation of pollen grains (microspores) and ovules (female gametes).

3. **Formation of Microspores**:
- The male reproductive part produces microspores through meiosis. A single microspore mother cell undergoes meiosis to form four microspores, which are equal in size. This process does not involve unequal division.

4. **Formation of Ovum**:
- In the female reproductive part, a megasporangium undergoes meiosis to produce four megaspores, but typically only one survives to form the ovum. The process leading to the formation of the ovum involves unequal division.

5. **Formation of Pollen Grains**:
- Each microspore develops into a pollen grain, which consists of a vegetative cell and a generative cell. The generative cell divides to form two male gametes, which involves unequal division.

6. **Zygotic Embryogenesis**:
- After fertilization, the zygote undergoes mitotic division to form two cells that are unequal in size (the apical and basal cells). This is also an example of unequal division.

7. **Conclusion**:
- Among the processes discussed, the formation of microspores (pollen grains) is the only process that does not involve unequal division. Therefore, the correct answer is the formation of microspores.

### Final Answer:
The process in angiosperms that does not involve an unequal division is the **formation of microspores**.

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